I started out soldering pin by pin on the CPU, but then ended up settling on the solder wick method. Essentially you run a line of solder across all the pins, then run a solder wick parallel to the pins on the top of them and suck up the excess solder. It eliminates solder bridges, but the solder remains under the pins since you ran the wick across the top.
AT90USB162 CPU U15 (Top)
Close up of CPU
16Mhz Xtal X2 (bottom)
Close up of Xtal
U15, X2
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